Sonically, the NAD C 390DD was never less than pleasing. Open, even and spacious, it proved a polished performer but fell down the rankings thanks to its rather matter of fact, emotionally uninspiring sound. Still, many prospective purchasers will still find it appealing because of its power, operational flexibility and upgradeability - although few are likely to buy it for its looks or finish. The Moon 250i was a very nice amplifier indeed. One of the best balanced here, it didn't have any breathtaking strengths or glaring weaknesses, appearing instead to do most things very well. In terms of tonal balance and general transparency it was excellent: highly neutral with no quirks or foibles. There was a lot of low-level detail and stereo imaging was good too.
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机译：声音上，NAD C 390DD从未令人失望。开放，平坦，宽敞，虽然表现出色，但由于它的实际效果和令人沮丧的声音而排名下降。尽管如此，由于其强大的功能，操作的灵活性和可升级性，许多潜在的购买者仍会觉得它很有吸引力-尽管很少有人会为它的外观或外观而购买它。 Moon 250i确实是一个非常不错的放大器。这里是最好的平衡之一，它没有任何惊人的优势或明显的劣势，而是看起来可以很好地完成大多数事情。就色调平衡和总体透明度而言，它是出色的：高度中性，没有古怪或脆弱。底层细节很多，立体声成像也不错。
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